JP2003004035A - Bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device with improved sealing performance and excellence in disassembling and assembling workability. SOLUTION: There is provided a bearing device comprising an inner race divisible axially, an outer race divisible axially, conical rollers of four rows arranged in a freely rotatable manner between the inner race and the outer race, a seal body attached to either race and equipped with at least one rip portion of the end face contact type, and a seal sliding contact member attached to either the inner race or the outer race and abutting against the above rip portion. Since contact pressure of the rip portion 922e is small, heat generation of a contact portion is restrained to make a contribution to lowering of bearing temperature itself, so that deterioration of lubricant is suppressed, benefiting use for high speed range. Further, reduction of the contact pressure of the rip portion 922e contributes decrease in an amount of abrasion, of the sliding contact surface on the seal sliding contact member 924 and, of the sliding contact portion on the rip portion 922e and besides causes excellence in following-up ability in the case of abrasion of the rip portion 922e, so that degradation of sealing performance can be lowered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device including a roll neck bearing used in, for example, a rolling mill for steel equipment.

[0002]

2. Description of the Related Art As a roll neck bearing used for a work roll or an intermediate roll of a hot rolling mill or a cold rolling mill, a double row or a four row tapered roller bearing capable of supporting a large load is used. Is common.

By the way, in a rolling mill or the like, a large amount of cooling water is supplied to a work roll or the like to control the shape of the product in order to accurately ensure the plate thickness of the product. Therefore, the roll neck bearing inherently needs a sealing device for preventing such intrusion of cooling water.

As such a sealing device, for example, an actual flat flat 6-
Some are equipped with contact-type seals such as oil seals as described in No. 82437. In such an oil seal according to the related art, a core metal is fitted to the inner peripheral surface on the outer ring side, and a seal portion extending from the core metal is brought into contact with the outer peripheral surface on the inner ring side. According to this conventional technique, a simple and inexpensive sealing device is provided.

[0005]

By the way, in recent years, speeding up of rolling mills and the like has been attempted in order to promote the efficiency of work, which has made the bearing environment harsh. Therefore, it is necessary to further improve the hermeticity. On the other hand, for example, if the contact type seals are provided in double, the sealing performance can be improved, but a space for providing double seals is required, which leads to an increase in size of the apparatus. Further, as the speed is increased, the axial contact type seal contact portion generates too much heat, which may lead to early damage of the seal portion. Furthermore, if the tightening force is reduced in order to suppress heat generation or the like of the seal contact portion, there is a problem that the sealability is significantly deteriorated.

In the rolling mill roll neck bearing, it is necessary to periodically disassemble and maintain the bearings and seals in order to inspect the bearings and seals and replenish the lubricant, and the seal structure becomes an obstacle to disassembling and assembling the bearings. must not. The restriction for disassembling and assembling has been a major obstacle to improving the sealing performance. In addition, roll neck bearings for rolling mills
When used with grease lubrication, the grease is often not replenished, and in order to prevent grease leakage and water intrusion, a shaft contact type seal is usually used.

In view of the above problems, it is an object of the present invention to provide a bearing device which has improved hermeticity and is excellent in disassembling and assembling.

[0008]

In order to achieve the above object, the bearing device of the present invention has an axially dividable inner ring, an axially dividable outer ring, and a space between the inner ring and the outer ring. , 4 rows of tapered rollers rotatably arranged,
A seal body attached to one of the inner ring and the outer ring and provided with at least one end face contact type lip portion, and a seal slide attached to the other ring of the inner ring and the outer ring and abutting on the lip portion. And a moving member.

[0009]

According to the bearing device of the present invention, an axially dividable inner ring, an axially dividable outer ring, and four rows of conical rotatably arranged between the inner ring and the outer ring. A roller, a seal body attached to one of the inner ring and the outer ring and having at least one end surface contact type lip portion, and attached to the other ring of the inner ring and the outer ring and contacting the lip portion. A seal sliding member that contacts,
Have. A shaft contact type seal generally uses a spring or the like and requires a tightening force (tightening force) directed inward in the radial direction, and even if the shaft is shaken, there is a gap between the lip and the shaft. Since we are considering not to open
Some contact pressure is required. On the other hand, in the case of the end face contact type such as the seal body of the present invention, the contact pressure of about the amount applied to the seal sliding member is sufficient, so that the heat generation at the contact portion of the lip portion can be suppressed low. Therefore, even in the speed range where heat generation or the like is a problem in the shaft contact type seal, the end face contact type seal can be used without problems. Since the contact pressure at the lip is small in this way, heat generation at the contact is suppressed, contributing to a reduction in the bearing temperature itself.
As a result, deterioration of the lubricant can be suppressed, which is advantageous for use in the high speed range. Further, when the contact pressure of the lip portion is reduced, it contributes to the reduction of the wear amount of the sliding contact surface of the seal sliding member and the sliding contact portion of the lip portion, and even if the lip portion is worn, its followability is excellent. Therefore, the change in the sealing performance can be suppressed to be small, and thus the sealing function can be stably exhibited for a long period of time. Further, in the end face contact type such as the seal body of the present invention, there is an advantage that it is not easily affected by the rotational shake of the shaft, so that it is not necessary to consider the gap between the shaft and the lip portion which are in contact with each other on the end face. . The end face contact type seal means a seal of a type in which a lip portion contacts at least a surface (for example, an end surface) extending in the radial direction.

Further, by forming the labyrinth seal by bringing the seal sliding member and the one ring close to each other, it is possible to increase the number of lips which causes a problem of mounting space and an increase of heat generation. , The labyrinth effect can be used to further enhance the sealing performance.

Further, if at least a part of the seal body is sandwiched between the one ring and a holder member attached to the one ring, plastic working such as caulking and parts such as bolts are performed. It is possible to prevent the seal body from coming off without adding.

Further, at least a part of the seal body is
When fitted in the recess formed in the one ring or the holder member attached to the one ring, the sealing body is prevented from coming off without plastic working such as caulking or adding parts such as bolts. it can.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing the periphery of a work roll end of a rolling mill supported by using a bearing device according to the present invention. In FIG. 1, a four-row tapered roller bearing 10 includes two rows of inner rings 12 that support the work roll 1 of the rolling mill and that can be divided in the axial direction, and a plurality of rows of outer rings that are attached to the housing 2 and that can divide in the axial direction. Thirteen
And a cage 1 for holding four rows of tapered rollers (rolling elements) 14 arranged in plural between the inner ring 12 and the outer ring 13.
It consists of 5. Sealing devices 20 are arranged on both sides of the bearing 10. The bearing 10 and the sealing device 20 constitute a bearing device. Since the pair of sealing devices 20 have the same configuration, only the sealing device 20 on the right side will be described.

FIG. 2A is an enlarged view of the II portion of FIG. FIG. 2B shows the outer ring holder 21 and the seal body 2.
It is a figure shown in the state where 2 and outer ring 13 were removed. Figure 2
In (a), the sealing device 20 includes a ring-shaped outer ring holder 21 and a seal body 2 attached to the outer ring holder 21.
2, a seal sliding member 24, a holding member 26 that holds the seal sliding member 24, a base portion 25 that attaches the holding member 26 to the inner ring, and a bolt 27.

A step portion 21a is formed on the left end surface of the outer ring holder 21.
On the other hand, on the right end surface of the outer ring 13, a step portion 2 is formed.
A step portion 13a is formed so as to face the step 1a, and when the outer ring holder 21 is assembled to the outer ring 13, the step portion 21a is formed.
a and 13a are engaged with each other.

Further, the outer ring holder 21 has a circumferential groove 21 on the outer circumference.
b, and an O-ring 23 is arranged in the peripheral groove 21b to seal between the outer peripheral surface of the outer ring holder 21 and the inner peripheral surface of the housing 2 (FIG. 1). On the right side surface of the outer ring holder 21, a capture groove 21c for capturing water and the like that drips from above along the right side surface is formed. A flange portion 21d extending in the radial direction is formed on the inner circumference of the outer ring holder 21.

The annular seal body 22 is composed of a core metal 22a having a substantially L-shaped cross section and a seal portion 22b. Core 22a
Is the inner peripheral surface 21e of the outer ring holder 21 and the flange portion 21d.
It is attached so as to abut. The outer ring holder 21 and the cored bar 22a may be crimped to suppress unnecessary separation. The seal portion 22b has lip portions 22c, 22d, 22e extending in three directions.

The seal sliding member 24 faces the core metal 22a of the seal body 22 and has a substantially L-shaped cross section.
A cylindrical portion 24a coaxial with the cylindrical portion 24a, a flange portion 24b extending radially outward from the right end of the cylindrical portion 24a, and a cylindrical portion 24
a small flange portion 2 extending inward in the radial direction from the left end of a
4c and. The lip portion 22c of the seal body 22,
22d contacts the outer peripheral surface of the cylindrical portion 24a,
2e is in contact with the inner flange surface of the flange portion 24b, and these slide with each other in accordance with the operation of the bearing 10.

A small-diameter portion 12 formed at the right end of the inner ring 12.
An annular base portion 25 is attached to a by press fitting. An annular holding member 26 is provided adjacent to the base portion 25. The holding member 26 has a loose fit with respect to the small diameter portion 12a. Left end small diameter portion 26 of the holding member 26
A small flange portion 24c is press-fitted onto the outer peripheral surface of b. The seal sliding member 24 is composed of the base portion 25 and the holding member 26.
The small flange portion 24c of the
6. Bolt 27 inserted in through hole 26a formed in No. 6
The seal sliding member 24 is attached to the base portion 25, that is, the small diameter portion 12a by screwing the seal sliding member 24 into a screw hole 25a formed in the base portion 25. The bolt 27 and the screw hole 25a of the base portion 25 form a fastening means.

Next, the operation of this embodiment will be described. In FIG. 1, the work roll 1 of the rolling mill has an inner ring 12
When rotated together, the tapered roller 14 rolls between the inner ring 12 and the outer ring 13, whereby the work roll 1 can be rotatably supported with respect to the housing 2.

In such a case, around the work roll 1,
Since a large amount of cooling water is applied, the cooling water may be scattered to the outside (right side) of the sealing device 20 in FIG. On the other hand, in the present embodiment, the seal body 2
The two lip portions 22c and 22d abut on the outer peripheral surface of the cylindrical portion 24a, and the lip portion 22e abuts on the inner flange surface of the flange portion 24b, so that sealing is performed at three locations, so that the sealing performance is improved. It can be raised more. In addition, the contact between the lip portion 22e and the inner flange surface of the flange portion 24b is determined by the lip portion 22d and the cylindrical portion 24a.
Since it is performed outward in the radial direction, the length of the seal sliding member 24 in the axial direction can be suppressed, thereby making the device configuration compact.

On the other hand, for example, when performing maintenance,
Rotate the bolt 27 counterclockwise (that is, the seal sliding member 24
The holding member 26, which is loose fit to the small diameter portion 12a of the inner ring 12, can be easily removed from the small diameter portion 12a integrally with the seal sliding member 24 by removing the holding member 26 from the small diameter portion 12a of the inner ring 12 by removing the holding member 26 from the small diameter portion 12a. I can.

FIG. 3A is a sectional view similar to FIG. 2 according to the second embodiment, and FIG. 3B shows the outer ring holder 21, the seal sliding member 124 and the outer ring 13 removed. It is a figure similar to FIG.2 (b) shown in a state. The second embodiment differs from the embodiment shown in FIG. 2 in the sealing device 120.
Since only the shape of the seal sliding member 124 in FIG. 3 is different, detailed description of other similar configurations will be omitted.

In FIG. 3A, unlike the first embodiment, the seal sliding member and the holding member are integrated to form a new seal sliding member 124. More specifically, the substantially annular seal sliding member 124 has a flange portion 124b extending radially outward at the right end thereof, and a counterbore 124c formed radially inward thereof. A through hole 124d that penetrates the seal sliding member 124 in the axial direction is formed in the counterbore 124c.

The lip portions 22c and 22d of the seal body 22
Contacts the outer peripheral surface 124a of the seal sliding member 124,
The lip portion 22e is in contact with the inner flange surface of the flange portion 124b, and they slide with each other according to the operation of the bearing 10.

The seal sliding member 124 has a loose fit with the small diameter portion 12a of the inner ring 12, and the bolt 27 inserted through the through hole 124d is screwed into the screw hole 25a formed in the base portion 25. As a result, the seal sliding member 124 is attached to the small diameter portion 12a.

Also in this embodiment, if the bolt 27 is rotated counterclockwise (that is, by applying a force in a direction different from the direction in which the seal sliding member 24 is pulled out), the bolt 27 is loosely fitted to the small diameter portion 12a of the inner ring 12. It is possible to easily remove the certain seal sliding member 124 from the small diameter portion 12a. Further, as compared with the first embodiment, since the holding member and the seal sliding member are integrated, the number of parts can be reduced and the time and effort required for disassembly and assembly can be reduced.

FIG. 4 is a block diagram of the third embodiment shown in FIG.
It is sectional drawing similar to (a). The third embodiment is different from the embodiment shown in FIG.
4 and the base 225 are different in shape, and detailed description of other similar configurations will be omitted.

In FIG. 4, the seal sliding member 224 is flattened as compared with the second embodiment, and the axial length of the base portion 225 is lengthened by that amount. More specifically,
The disc-shaped seal sliding member 224 loosely fitted to the small diameter portion 12a of the inner ring 12 has a small diameter portion 12a.
Is in contact with the right end surface of the base portion 225 fitted and attached to. The bolt 27 is attached to the through hole 22 of the seal sliding member 224.
4a is penetrated and further screwed into a screw hole 225a formed in the base portion 225, whereby the seal sliding member 22
4 is attached to the small diameter portion 12a.

Lip portions 22c and 22d of the seal body 22
Comes into contact with the outer peripheral surface 225b of the base portion 225, and the lip portion 2
2e is an inner flange surface 224b of the seal sliding member 224.
Are in contact with each other, and they slide with respect to each other according to the operation of the bearing 10.

Also in this embodiment, if the bolt 27 is rotated counterclockwise (that is, by applying a force in a direction different from the direction in which the seal sliding member 24 is pulled out), it can be loosely fitted to the small diameter portion 12a of the inner ring 12. A certain seal sliding member 224 can be easily removed from the small diameter portion 12a. Further, as compared with the first embodiment, since the holding member and the seal sliding member are integrated with each other, the number of parts is reduced and the labor for disassembling and assembling is reduced. The member 224 also has an effect that it can be formed at low cost by pressing a metal plate.

FIG. 5 is a block diagram showing the configuration of FIG. 2 according to the fourth embodiment.
It is sectional drawing similar to (a). The fourth embodiment is different from the embodiment shown in FIG. 2 in that the small diameter portion of the inner ring is omitted. Detailed description of other similar configurations will be omitted.

In FIG. 5, a screw hole 312a is formed in the right end surface of the inner ring 312. The bolt 327 penetrates the through hole 326a of the cylindrical holding member 326, and the screw hole 3
12a, and the holding member 326 is attached to the end surface of the inner ring 312.

A seal sliding member 324 having a substantially L-shaped cross section
Is a stepped portion 326 formed on the outer peripheral surface of the holding member 326.
B is prevented from coming out and is fitted and fixed. The lip portions 22c and 22d of the seal body 22 are formed by the seal sliding member 3
24 is in contact with the cylindrical surface 324a, and the lip portion 22e is in contact with the flange surface 324b of the seal sliding member 324, and these slide with each other in accordance with the operation of the bearing 10.

Also in this embodiment, the inner ring 312 can be removed by rotating the bolt 327 counterclockwise (that is, by applying a force in a direction different from the direction in which the seal sliding member 24 is pulled out).
On the other hand, the holding member 326 is integrated with the seal sliding member 324 and can be easily removed. Further, the number of parts can be reduced and the time and effort required for disassembly and assembly can be reduced as compared with the first embodiment.

FIG. 6A is a sectional view similar to FIG. 2A according to the fifth embodiment. The fifth embodiment differs from the embodiment shown in FIG. 2 in that a seal sliding member is attached without using bolts. Detailed description of other similar configurations will be omitted.

In FIG. 6A, the seal sliding member 52
A protrusion 524c that protrudes inward in the radial direction is formed at the left end of the fourth cylindrical portion 524a. On the other hand, a peripheral groove 512c is formed on the inner periphery near the right end of the inner ring 512.
The seal sliding member 524 has the projection 524c and the circumferential groove 512c.
Is attached to the inner ring 512 by engaging with.

FIG. 6 (b) is an enlarged view of the VIB portion of FIG. 6 (a). A tool T is used when the seal sliding member 524 is disassembled. As shown in FIG. 6B, the tool T
Insert the pointed tip of the into the circumferential groove 512c of the inner ring 512,
The protrusion 524c of the seal sliding member 524 is opened (that is, a force is applied in the direction of the arrow different from the pulling direction of the seal sliding member 524) to disengage from the circumferential groove 512c, whereby the seal sliding member 524 is released. The moving member 524 can be removed. As shown in FIG. 6B, a chamfer 512d is formed on the shoulder of the circumferential groove 512c, and the projection 5
If the chamfer 524d is formed on the shoulder portion of 24c, it is possible to prevent them from being deformed when the tool T is hit.

FIG. 6 (c) is a diagram showing a modification of this embodiment. In this modified example, the protrusion 524c 'of the seal sliding member 524' is formed by plastic deformation, so that it can be manufactured at a lower cost.

FIG. 7A is a sectional view similar to FIG. 2A according to the sixth embodiment, and FIG. 7B shows a state in which the outer ring holder 621 and the seal body 622 are removed. It is a figure shown by. The sixth embodiment is different from the embodiment shown in FIG. 2 mainly in that the positional relationship between the seal sliding member and the seal body is different. Detailed description of other similar configurations will be omitted.

In FIG. 7A, the outer ring holder 621 is
Is a flange portion 6 that extends radially inward at the right end.
21d is formed. Metal core 622a of the seal body 622
Has a substantially L-shaped cross section, and its cylindrical portion 6
22f is brought into contact with the inner peripheral surface of the outer ring holder 621, and a projection 622h protruding radially outward from the left end of the cylindrical portion 622f is engaged with the inner peripheral stepped portion 621e of the outer ring holder 621. A part of the seal body 622 is sandwiched and positioned by the outer ring holder 621 and the outer ring 13. As a result, it is possible to prevent the seal from falling off without adding plastic working such as caulking or adding parts such as bolts.

The lip portions 622c, 62 of the seal body 622
2d abuts on the outer peripheral surface of the cylindrical portion 624a of the seal sliding member 624, which is press-fitted with the outer periphery of the small diameter portion 12a of the inner ring 12 with a sufficient interference, and the lip portion 622e is the flange of the seal sliding member 624. It abuts the surface 624b so that they slide relative to each other in response to the operation of the bearing 10.

In the present embodiment, the seal sliding member 6
The flange surface 624b, which is the contact surface of the bearing 24,
Since it faces outward in the axial direction of 0, when the seal body 622 is removed integrally with the outer ring holder 621 at the time of maintenance or the like, the flange surface 6 of the seal sliding member 624 is removed.
24b does not interfere with this, so that the seal body 622 can be easily disassembled.

In this embodiment, although the seal sliding member 624 is press-fitted to the inner ring 12, the seal body 622 can be easily disassembled and the seal sliding member 624 is attached. Since there is no need for a bolt or the like, the number of parts can be reduced.

FIG. 8 is a block diagram showing the configuration of FIG. 2 according to the seventh embodiment.
It is sectional drawing similar to (a). The seventh embodiment differs from the embodiment shown in FIG. 2 only in the structure of the seal body. Detailed description of other similar configurations will be omitted.

In the embodiment of FIG. 8, unlike the embodiment of FIG. 2, the seal portion 722b is in contact with the flange surface 24b of the seal sliding member 24, and the single lip portion 72 is in contact.
2e is provided. Therefore, the cost of the seal body 722 can be reduced. With the shaft contact type seal,
Generally, a spring or the like is used, and a tightening force directed inward in the radial direction is required, and it is considered that the gap between the lip and the shaft does not open even if the shaft shakes due to rotation. Contact pressure of is required. In the case of the end surface contact type as in the present embodiment, the contact pressure that is applied to the seal sliding member 24 is sufficient, so the lip portion 722e
It is possible to suppress the heat generation at the contact portion of. Further, in the end surface contact type as in the present embodiment, since it is less susceptible to the rotational shake of the shaft, the gap between the shaft (here, the seal sliding member 24) and the lip portion 722e that are in contact with each other is eliminated. There is an advantage that you do not have to consider it. Incidentally, it is clear that the single lip portion of the seal body is
Although it is applicable to the other embodiments in this specification, the number of such lip portions may be other than one or three.

FIG. 9 is a block diagram of the second embodiment of FIG.
It is sectional drawing similar to (a). The eighth embodiment differs from the embodiment shown in FIG. 2 only in that the outer ring and the outer ring holder are integrated. Detailed description of other similar configurations will be omitted.

In FIG. 9, the core metal 22a of the seal body 22 is attached to the step portion 813a formed on the inner periphery of the right end of the outer ring 813. According to this embodiment, the number of parts can be reduced. Incidentally, the integration of the outer ring and the outer ring holder can be similarly applied to the embodiments shown in FIGS.

FIG. 10 is a block diagram showing the configuration of FIG. 2 according to the ninth embodiment.
It is sectional drawing similar to (a). The ninth embodiment differs from the embodiment shown in FIG. 2 mainly in the configuration around the seal body and the seal sliding member. Detailed description of other similar configurations will be omitted.

In FIG. 10, the seal body 922 is composed of a core metal 922a having a crank-shaped cross section, and a seal portion 922b having the lip portions 922c, 922d, 922e as in the above-described embodiment. Core metal 922
The peripheral edge (upper end in FIG. 10) of a is sandwiched between the end surface of the outer ring 13 and the stepped portion 921a formed on the end surface of the outer ring holder 921, and is fixed to the outer ring 13.
As a result, it is possible to prevent the sealing body 922 from coming off without plastic working such as caulking or adding parts such as bolts.

The seal sliding member 924 has a substantially L-shaped cross section, a cylindrical portion 924a coaxial with the inner ring 912, and a flange extending radially outward from the right end of the cylindrical portion 924a in FIG. And a portion 924b. A through hole 924c for the bolt 27 is formed in the cylindrical portion 924a in the axial direction. Lip portions 922c and 922d of the seal body 922
Comes into contact with the outer peripheral surface of the cylindrical portion 924a, and the lip portion 922
e is in contact with the inner flange surface of the flange portion 924b, and these slide with each other in accordance with the operation of the bearing 10.

An annular base portion 925 is press-fitted to the small diameter portion 912a formed at the right end of the inner ring 912 in FIG. The claw portion 925a protruding from the inner circumference of the left end of the base portion 925 in FIG. 10 engages with the circumferential groove 912b formed on the outer circumference of the small diameter portion 912a, whereby the base portion 925 is formed.
The inner ring 912 is prevented from coming off. By screwing the bolt 27 into the screw hole 925b formed in the base portion 925, the seal sliding member 924 can be detachably attached to the base portion 925.

Further, in the present embodiment, the inner peripheral surface 921b of the outer ring holder 921 and the outer peripheral edge 924f of the seal sliding member 924 face each other with a slight gap (that is, form a narrow path) therebetween. The bearing 10
At the time of operation, the labyrinth seal is formed by the inner peripheral surface 921b and the outer peripheral edge 924f. Therefore, even if the contact type lip cannot be provided any more due to space constraints, the sealing performance can be further improved. Incidentally, forming the labyrinth seal in this manner is similarly applicable to the embodiments shown in FIGS.

FIG. 11 is a sectional view similar to FIG. 2A according to the tenth embodiment. The tenth embodiment is different from the embodiment shown in FIG. 10 only in the configurations of the outer ring holder and the seal sliding member, and thus detailed description of other similar configurations will be omitted.

As shown in FIG. 11, also in this embodiment, the peripheral edge (upper end in FIG. 11) of the cored bar 922a is a step portion 921a formed on the end face of the outer ring 13 and the end face of the outer ring holder 921 '. It is sandwiched between the outer ring 13 and the outer ring 13 and is fixed to the outer ring 13.

Further, also in this embodiment, the outer side inner peripheral surface 921b 'of the outer ring holder 921' and the outer peripheral edge 924f 'of the seal sliding member 924' are separated by a slight gap (that is, narrowed). Although facing each other (forming a path), the outer side inner peripheral surface 921b ′ has a taper shape whose diameter increases toward the outer side (right side in FIG. 11), and the outer peripheral edge 9
24f 'also has a taper shape corresponding to it. Therefore, it is possible to enhance the effect of shaking off the foreign matter when the bearing 10 is in operation, thereby forming a more effective labyrinth seal.

FIG. 12 is a sectional view similar to FIG. 2A according to the eleventh embodiment. The ninth embodiment is
The structure of the seal body and the outer ring holder is mainly different from that of the embodiment shown in FIG. Detailed description of other similar configurations will be omitted.

In FIG. 12, the seal body 1122 is composed of a cored bar 1122a having an L-shaped cross section and a seal part 1122b provided with the lip parts 1122c, 1122d, 1122e as in the above-described embodiment. The outer peripheral cylindrical portion (upper portion in FIG. 12) of the core metal 1122a is the outer ring 13
It is sandwiched between the end surface of the outer ring holder 1121 and the step portion 1121a formed on the inner peripheral surface of the outer ring holder 1121, and is fixed to the outer ring 13.

Further, in the present embodiment, a step portion 1121b is formed on the inner peripheral surface of the outer end portion (the right end in FIG. 12) of the outer ring holder 1121 and the seal sliding member 924. And the outer peripheral edge 924f of the outer peripheral surface 924f face each other with a slight gap therebetween (that is, form a narrow path) so that when the bearing 10 operates, the step 1121b and the outer peripheral edge 924 of the outer peripheral edge 924f.
A labyrinth seal is formed with f.
According to the present embodiment, as is clear from FIG. 12, the narrow path formed by the step portion 1121b and the outer peripheral edge 924f can be formed without changing the thickness of the outer peripheral edge 924f in the axial direction.
It can be made longer than that of 0, and since the narrow path is bent, the sealing performance can be further improved.

FIG. 13 is a sectional view similar to FIG. 2A according to the twelfth embodiment. The ninth embodiment is
The structure of the seal body is mainly different from that of the embodiment shown in FIG. Detailed description of other similar configurations will be omitted.

In FIG. 13, the seal body 1222 is formed of a core metal 1222a having an L-shaped cross section and a seal portion 1222b provided with the lip portions 1222c, 1222d and 1222e as in the above-described embodiment. On the outer peripheral surface of the cored bar 1222a, the protrusions 122 continuous in the circumferential direction are formed.
2 g are formed. When the seal body 1222 is inserted into the outer ring holder 1221, the cored bar 1222a is elastically deformed. However, when the seal body 1222 is pushed to a predetermined position as it is, the convex portion 1222g causes the outer ring holder 1221 to have such a convex portion.
By fitting in the peripheral groove (recess) 1221a formed on the inner peripheral surface of the core metal 1222a, the cored bar 1222a is restored from elastic deformation, whereby the cored bar 1222a is fixed to the outer ring holder 1221. By such fitting and attachment, it is possible to prevent the seal body 1222 from coming off without performing plastic working such as caulking or adding parts such as bolts. .

Further, also in this embodiment, the inner peripheral surface 1221b of the outer ring holder 1221 and the seal sliding member 92 are
4 and the outer peripheral edge 924f face each other with a slight gap therebetween (that is, form a narrow path), thereby forming a labyrinth seal between the inner peripheral surface 1221b and the outer peripheral edge 924f during operation of the bearing 10. It is supposed to do.

FIG. 14 is a sectional view similar to FIG. 2A according to the thirteenth embodiment. The ninth embodiment is
It differs from the embodiment shown in FIG. 13 in that the outer ring and the outer ring holder are integrated. Detailed description of other similar configurations will be omitted.

In this embodiment, the right end of the outer ring 1313 in FIG. 10 is extended, and the core metal 1222a of the seal body 1222 is fitted in the circumferential groove (recess) 1313a formed on the inner circumferential surface of the outer ring 1313.
By fitting the convex portion 1222g of the core metal 1222a
Is fixed to the outer ring 1313.

Further, also in this embodiment, the outer ring 13
The inner peripheral surface 1313b of 13 and the outer peripheral edge 924f of the seal sliding member 924 face each other with a slight gap (that is, form a narrow path) therebetween, so that when the bearing 10 operates, the inner peripheral surface The surface 1313b and the outer peripheral edge 924f form a labyrinth seal. According to the present embodiment, by integrating the outer ring and the outer ring holder,
The number of parts can be reduced. Incidentally, the integration of the outer ring and the outer ring holder can be similarly applied to the embodiments shown in FIGS.

(Example) FIG. 15 is a diagram showing a test apparatus used in the seal test conducted by the present inventors.
15A is a sectional view thereof, and FIG.
It is a figure which expands and shows the XVB part in (a). This test apparatus will be described. In the figure, a rotary shaft 1401 rotated by a motor (not shown) is shown in FIG.
A disk 1402 is joined to the left end of the so as to rotate integrally. The disc 1402 has a flange 140 that extends outward in the radial direction at the right end in FIG.
2a is formed.

Further, a cylindrical member 1403 is fixed by a bolt (not shown) near the outer periphery of the right end of the disc 1402 in FIG. 15A so as to rotate integrally therewith. The cylindrical member 1403 is hollow and forms a flange 1403a that extends radially outward from the right end in FIG. A fixed cylindrical member 1404 is arranged so as to enclose the cylindrical member 1403. Fixed cylindrical member 1
404 is fixed by a bolt (not shown) to the right end in the figure of an annular portion 1405 fixed to a housing (not shown). Further, the fixed cylindrical member 1404 has a flange 1404a that extends radially inward from the right end in the figure to a position slightly separated from the outer peripheral edge of the flange 1403a. Here, the flange 1402a of the disc 1402, the cylindrical member 1403, and the fixed cylindrical member 1404 form an annular space A. Water can be supplied to the annular space A from the outside through a water supply pipe 1407 that radially penetrates the uppermost peripheral wall of the fixed cylindrical member 1404. On the other hand, a through hole 1404b that penetrates the lowermost peripheral wall of the fixed cylindrical member 1404 in the radial direction is formed, and this functions as a drainage port for draining the water supplied to the annular space A.

As shown in FIG. 15B, the annular portion 140
5, a step portion 1405a is formed on the inner circumference at the left end in the figure. The core metal 1422a of the seal body 1422 is as shown in FIG.
The cross section shown in (b) has a substantially crank shape, the outer edge of which is engaged with the step portion 1405a, and is restrained from the left side of the drawing by the restraining plate 1406 so as to be between the annular portion 1405. It is fixed by being sandwiched between. The restraining plate 1406 is fixed to the annular portion 1405 with a bolt (not shown).

In FIG. 15B, a frusto-conical lip portion 1422b extending from the inner peripheral edge of the core metal 1422a to the right and radially outward in the figure has the outer peripheral edge of the disc 1402. Flange (corresponding to seal sliding member) 1402
It is in contact with a. That is, the core metal 1422a and the lip portion 1422b are used to form the end face contact type seal portion 14
22 are configured.

In FIG. 15A, a cover member 1408 is attached to the left end of the pressing plate 1406 with a bolt (not shown), and by covering the left side of the disc 1402, the cylindrical space B is formed inside. Is forming. Cover member 14
At the lowermost part of 08, the pipe 14 communicating with the cylindrical space B
09 is attached so as to extend downward, through which water that has entered the cylindrical space B can be discharged. The cylindrical space B communicates with the outside through only the pipe 1409. Therefore, by measuring the amount of water passing through the pipe 1409, the amount of water that has entered the cylindrical space B can be measured.

In such a test apparatus, the rotating shaft 1401
When water is supplied from the pipe 1407 to the annular space A while rotating, the majority of the supplied water is the through hole 1404b.
It is drained to the outside through the
Through the gap between the inner periphery of 405 and the flange 1402a of the disc 1402, the lip portion 14 of the seal portion 1422 is further provided.
It passes through between 22b and the flange 1402a, and reaches the cylindrical space B. The smaller the amount, the more the seal part 1
The sealability of 422 is excellent.

Test results using the test apparatus will be described with reference to FIG. FIG. 16 (a) shows
5 in the seal portion 1422.
5 + 0.68 mm) side shows the measurement result of the leakage amount with respect to the rotation speed, and FIG. 16 (b) shows the measurement result of the leakage amount with respect to the rotation speed on the side of shimeshiloa (2.5-0.68 mm). FIG. 16C is a summary of the measurement results. The water supply is 1 per minute in principle.
Although it was set to 000 cc, in the case of 100 revolutions per minute, it was set to 7500 cc per minute on the shimeiro upper side and 3500 cc per minute on the shimeiro lower side. As is clear from the above, in any case, it was confirmed that sufficient sealability could be ensured. In addition, in the test piece on the side of
After the test, small cracks were visually recognized on the lip, but as shown in the measurement results, the sealability was not affected.

FIG. 17 is a diagram showing the measurement results of the lip temperature with respect to the rolling speed. If the end face contact type seal portion as in this embodiment is used, it can be determined that it can be used up to a high speed region of about 3300 m / min at a rolling speed, as shown in FIG.

FIG. 18 is a diagram showing the relationship between the interference and the leakage amount. Particularly in a bearing used under high speed conditions, the clearance inside the bearing tends to be large, so that the displacement amount of the lip portion and the seal sliding member is large. Here, in the shaft contact type seal, the amount of misalignment between the lip and the seal sliding member is smaller than the amount of misalignment between the lip and the seal sliding member, so that the seal tends to leak.

For example, taking a bearing having an inner diameter of about 350 mm as an example, in a shaft contact type seal, at least 0.7 mm is necessary to maintain the sealing effect with a seal shimiro design value of about 1 mm. Depending on the clearance tolerance inside the bearing, the lip part is separated from the outer peripheral surface of the shaft by a maximum of 0.2 mm in the radial direction, and the outer ring holder itself can also be displaced in the radial direction within the range of the assembly tolerance. It can be said that it is difficult to hold.

On the other hand, in the case of the end face contact type seal, if the design value of the seal shimiro is about 2.5 mm, at least 1.5 m is required to maintain the sealing effect.
m shimeshiro is required. In such a case, since the outer ring holder is fixed in the axial direction, it is not necessary to consider the influence exerted on the reduction of interference. Also, depending on the clearance tolerance inside the bearing, the lip portion and the seal sliding member may have a maximum of 0.
Even if it is separated by 65 mm in the axial direction, 1.5
Since it does not fall below mm, sufficient sealability can be secured. In addition, there is no problem with the sealing performance at the upper and lower limit values of Simeiro. Further, from the experimental results of FIGS. 16 and 18, it was confirmed that even if the seal lip was used for a long time and some cracks were generated in the seal lip, the sealability was not affected.

Although the present invention has been described above with reference to the exemplary embodiments, the present invention should not be construed as being limited to the above-described exemplary embodiments, but it goes without saying that appropriate modifications and improvements are possible. is there. An example in which the structure in FIG. 15B is applied to the present invention is shown in FIG. In FIG.
The seal body 1422 is the step portion 142 of the outer ring holder 1421.
It is formed of a core metal 1422a attached to 1a and a lip portion 1422b extending from the inner peripheral edge thereof.
An outer end of the lip portion 1422b has a seal sliding member 142.
4 is in contact with the inner end surface of the flange portion 1424b.
Similar to the embodiment described above, the seal sliding member 1424 is attached by the bolt 27 to the base portion 1425 attached to the outer circumference of the inner ring 12. Also in the present embodiment, the inner peripheral surface 1421b of the outer ring holder 1421,
The outer peripheral edge 1424f of the flange portion 1424b of the seal sliding member 1424 is opposed to the outer peripheral edge 1424f with a slight gap (that is, forms a narrow path), and when the bearing (not shown) is operating, the inner peripheral surface is 1421b and outer peripheral edge 1424f
And form a labyrinth seal.

[0078]

According to the bearing device of the present invention, an inner ring which can be divided in the axial direction, an outer ring which can be divided in the axial direction,
4 rotatably arranged between the inner ring and the outer ring
A row of tapered rollers, a seal body attached to one of the inner ring and the outer ring and having at least one end face contact type lip portion, and attached to the other ring of the inner ring and the outer ring, the lip And a seal sliding member that abuts against the section. A shaft contact type seal generally uses a spring or the like and requires a tightening force that is directed inward in the radial direction, and prevents the gap between the lip and the shaft from opening even if the shaft shakes. Considering that, some contact pressure is required. On the other hand, in the case of the end face contact type such as the seal body of the present invention, the contact pressure of about the amount applied to the seal sliding member is sufficient, so that the heat generation at the contact portion of the lip portion can be suppressed low. Further, in the end face contact type such as the seal body of the present invention, there is an advantage that it is not easily affected by the rotational shake of the shaft, so that it is not necessary to consider the gap between the shaft and the lip portion which are in contact with each other on the end face. .

In the case of a bearing device used for a rolling mill such as a tandem mill, in the shaft contact type seal, a rubber material is usually used in the front stage where the rolling speed is relatively low, and the rear stage where the rolling speed is relatively high. If a heat-resistant rubber material is used, it will be disadvantageous in terms of maintenance and standardization. However, if a seal made of a heat-resistant rubber material is used in both the first and second stages, it is disadvantageous in terms of cost. On the other hand, if the end face contact type seal is used, the same material (rubber that is not a heat resistant material) can be used in both the front and rear stages, which is advantageous in terms of maintenance, common parts, and cost.
Further, the performance of the normal shaft contact type seal is remarkably deteriorated with respect to the cracks in the lip portion due to the deterioration of the rubber over time, but the end face contact type seal of the present invention has some cracks as described above. Even if it occurs, there is an advantage that the initial performance can be secured.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the periphery of a work roll end of a rolling mill supported by using a bearing device according to the present invention.

FIG. 2 (a) is an enlarged view of a portion II of FIG. FIG. 2B is a diagram showing the outer ring holder 21, the seal body 22, and the outer ring 12 removed.

FIG. 3 (a) is a diagram of FIG. 2 according to a second embodiment.
3B is a cross-sectional view similar to that of FIG.
FIG. 5 is a view similar to FIG. 2B, showing a state in which 5, the seal sliding member 124 and the outer ring 13 are removed.

FIG. 4 is a sectional view similar to FIG. 3A according to a third embodiment.

FIG. 5 is a sectional view similar to FIG. 2A according to a fourth embodiment.

FIG. 6 (a) is a view showing a structure of FIG. 2 according to a fifth embodiment.
6B is a sectional view similar to FIG. 6A, and FIG.
It is a figure which expands and shows the VIB part of (a), and is a figure 6 (c).
FIG. 9 is a diagram showing a modified example of the present embodiment.

FIG. 7 (a) is a diagram of FIG. 2 according to a sixth embodiment.
FIG. 7B is a sectional view similar to FIG. 7A, and FIG. 7B is a diagram showing the outer ring holder 621 and the seal body 622 removed.

FIG. 8A according to a modified example of the seventh embodiment.
It is a sectional view similar to FIG.

FIG. 9 is a sectional view similar to FIG. 2A according to an eighth embodiment.

FIG. 10 is a sectional view similar to FIG. 2A according to a ninth embodiment.

FIG. 11 is a sectional view similar to FIG. 2A according to the tenth embodiment.

FIG. 12 is a sectional view similar to FIG. 2A according to an eleventh embodiment.

FIG. 13 is a sectional view similar to FIG. 2A according to the twelfth embodiment.

FIG. 14 is a sectional view similar to FIG. 2A according to a thirteenth embodiment.

15A and 15B are views showing a test apparatus used for the seal test conducted by the present inventors, FIG. 15A is a sectional view thereof, and FIG. 15B is a cross-sectional view of FIG. 15A. It is a figure which expands and shows a XVB part.

16A is a seal portion 1422 of FIG.
Shows the measurement result of the leakage amount with respect to the rotation speed on the side of the upper side (2.5 + 0.68 mm).
FIG. 16 (b) shows a simeiroroa (2.5-0.68m
FIG. 16C shows a summary of the measurement results of the leakage amount with respect to the rotation speed on the m) side.

FIG. 17 is a diagram showing measurement results of lip temperature with respect to rolling speed.

FIG. 18 is a diagram showing the relationship between the interference and the leakage amount.

FIG. 19 is a sectional view similar to FIG. 2A according to a fourteenth embodiment.

[Explanation of symbols]

1 Work Roll 2 Housing 12, 312, 512, 912 Inner Ring 13, 813, 1313 Outer Ring 14 Tapered Roller 20, 120, 220, 320, 520, 620, 72
0,820 Sealing device 22, 622,722,922,1122,1222 Seal body 24,124,224,324,524,624,72
4,924 Seal sliding member

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Katsuhiro Konno             1-5-50 Kumei, Kugenuma, Fujisawa-shi, Kanagawa             Within NSK Ltd. (72) Inventor Tomoyuki Aizawa             1-5-50 Kumei, Kugenuma, Fujisawa-shi, Kanagawa             Within NSK Ltd. (72) Inventor Kazuo Akakami             1-5-50 Kumei, Kugenuma, Fujisawa-shi, Kanagawa             Within NSK Ltd. F term (reference) 3J006 AE23 AE37 AE38                 3J016 AA04 BB03 BB17 CA02 CA06                 3J101 AA16 AA25 AA32 AA44 AA54                       AA62 BA53 BA54 BA73 DA09                       EA49 FA32 FA46 GA36

Claims (4)

[Claims] 1. An inner ring that can be divided in an axial direction, an outer ring that can be divided in an axial direction, and a rotatably arranged 4 ring between the inner ring and the outer ring.
A row of tapered rollers, a seal body attached to one of the inner ring and the outer ring and provided with at least one end face contact type lip portion, attached to the other ring of the inner ring and the outer ring, and the lip Bearing device having a seal sliding member that abuts against the portion. 2. The bearing device according to claim 1, wherein a labyrinth seal is formed by bringing the seal sliding member and the one wheel close to each other. 3. The bearing device according to claim 1, wherein at least a part of the seal body is sandwiched between the one ring and a holder member attached to the one ring. 4. At least a part of the seal body is fitted in a recess formed in the one ring or a holder member attached to the one ring. Bearing device.